(19)
(11) EP 0 286 358 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.01.1989 Bulletin 1989/02

(43) Date of publication A2:
12.10.1988 Bulletin 1988/41

(21) Application number: 88303022.3

(22) Date of filing: 05.04.1988
(51) International Patent Classification (IPC)4: G21F 9/00, G21F 9/18, G21F 9/30
(84) Designated Contracting States:
BE CH DE FR GB IT LI NL SE

(30) Priority: 08.04.1987 FI 871550

(71) Applicant: IMATRAN VOIMA OY
SF-00100 Helsinki 10 (FI)

(72) Inventors:
  • Tusa, Esko
    02700 Kauniainen (FI)
  • Maatta, Raimo
    00170 Helsinki (FI)
  • Ruuskanen,Antti
    04200 Kerava (FI)

(74) Representative: Clifford, Frederick Alan et al
MARKS & CLERK, 57/60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)


(56) References cited: : 
   
       


    (54) Procedure for treating low activity organic wastes from nuclear power plants with the aid of anaerobic fermentation


    (57) The invention concerns a procedure and a bioreactor for treating low activity wastes from nuclear power plants with the aid of anaerobic fermentation. The waste (11,28) is subjected to desired pretreatment, such as e.g. comminution (12) and suspending (13), or a special treatment (30), such as e.g. hydrolysis and/or physical dispersion, such as e.g. irradiation, heat treatment or equivalent. The pretreated waste is conducted into a bioreactor (15), where anaerobic decomposition takes place in two steps, the first step being an acid step (15a) and the second step, a methane step (15b). The gases produced in the decomposition process are conducted from the methane step (15b) to gas burning (27), and the undecomposed waste is removed from the process to concentration (20) and packed in barrels (21) or equivalent.







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